ROYERSFORD, Pennsylvania (AP), A U.S. man has perhaps the most valuable $10 certificate you'll ever see.

Billy Baeder owns the 1933 silver certificate that an auctioneer says is worth at least a half-million dollars.

The bill bears an unusual inscription, ``Payable in silver coin to bearer on demand,'' and has the serial number ``A00000001A.'' It is perhaps the most valuable bill printed since 1929, when bills were shrunk to their current size.

Baeder told Philly.com that his late father, also a collector, bought the bill two dozen years ago for about the price of a compact car.

Matthew Quinn, assistant director of currency for auction house Stack's Bowers, says the bill ``would easily be worth about $500,000 and up.''